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Question 5 (Total Marks: 14 marks) During a stocktake, a junior optical engineer found a sealed box consisting of 4 ports as shown in the figure below. The only labels on the box were the 'INPUT 1', 'INPUT 2', 'OUTPUT 1' and 'OUTPUT 2' as shown in the figure below and a label saying 'Operating wavelength =1550 nm′. The engineer decided to conduct a test to characterise the optical device in the sealed box. Using an optical laser source at 1550 nm with an optical power of 0dBm, the optical engineer measured the optical spectra at both output ports (OUTPUT1 and OUTPUT2). Here the light is input into the 'INPUT 1' port, and the measured spectra are shown below. Based on the measured output spectra: a. Name the optical component in the sealed box. (1 marks) b. Calculate the coupling coefficient of this device. (3 marks) c. Calculate the excess loss of this optical device. (2 marks) d. Calculate the insertion loss at the port labelled 'Output 1 '. (2 marks) e. Calculate the insertion loss at the port labelled 'Output 2' (2 marks)
f. To further characterise the optical component, the optical engineer also measured the output optical spectrum at the port labelled 'Input 2' as illustrated below. Based on this measurement, calculate the return loss of this device. (2 marks) g. After characterising the optical component, another optical engineer decides to use the optical component as part of an optical link. However, the optical engineer has connected the link input to 'OUTPUT 1' port while link output to the 'INPUT' ports of the device as shown below. Briefly discuss if this link will work with such connections and why. (2 marks)